<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body> 
    <div id="app">
        <p v-if="isActive"> v-if true</p>
        <p v-else> v-if false</p>
        <p v-show="isActive">v-show</p>
        <button @click="switchAction">切换状态</button>

        <p v-if="num == 0"> v-if true</p>
        <p v-else-if="num == 1"> v-if false</p>
        <p v-else>num 非0 非1 </p>
        <button @click="changeNum(0)">num为0</button>
        <button @click="changeNum(1)">num为1</button>
        <button @click="changeNum(2)">num 非0 非1</button>

    </div>


    <script>
        const app = Vue.createApp({
            data(){
                return{
                    isActive:true,
                    num:0
                }
            },
            methods:{
                switchAction(){
                    this.isActive = !this.isActive
                    console.log('this.isActive',this.isActive)
                },
                changeNum(number){
                    this.num = number
                }
            }
        })
        app.mount("#app")
    </script>



    
</body>
</html>